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Check idle current on PA 7 Nakamichi
Check idle current on PA 7 Nakamichi
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Old 5th July 2008, 04:09 PM   #1
Laurent Lafran is offline Laurent Lafran  France
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Default Check idle current on PA 7 Nakamichi

Hello to every sound lovers,
i'm a new happy owner of a Nakamichi PA7. I heard that sometime idle current are increasing and can make damage. So, before bringing my amplifier to a technical station i thought that i could have an idea by measuring the amplifier consuption on the main cable.
Do you think it's a good idea and what could be the consuption of the pa7 WITH 0volt on the input ?
Thanks,
Laurent.
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Old 5th July 2008, 04:40 PM   #2
analog_sa is online now analog_sa  Europe
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Default Re: Check idle current on PA 7 Nakamichi

Quote:
Originally posted by Laurent Lafran
Do you think it's a good idea
Not very good. One channel may be up, while the other is down and the total consumption is still normal. Just open it and measure the voltage drops on the emitter resistors. If it's similar to the Threshold amps you would expect around 100mA per transistor or maybe someone can provide accurate values.

Here is the relevant thread
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Old 5th July 2008, 11:35 PM   #3
Nelson Pass is offline Nelson Pass  United States
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Check idle current on PA 7 Nakamichi
Put your hands on the heat sinks. If you can hold them there for
10 seconds or so, then it's just right.
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Old 7th July 2008, 10:19 AM   #4
MadMutt is offline MadMutt  Australia
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To suit PA7 and PA7e.
From service manual.
Enjoy

PS, this 100k/1000pixels limit is really starting to wee wee me off big time..........
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Old 19th January 2009, 08:03 PM   #5
jiky657 is offline jiky657  Germany
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@MadMutt
Would it be possible to get a copy of the PA7e service manual?
My emailaddress is me@stairweb.de
Thanks a lot!
Regards
Markus
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Old 19th January 2009, 11:23 PM   #6
Laurent Lafran is offline Laurent Lafran  France
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Join Date: Jul 2008
Thanks to everybody.
My PA7 is now working with Rega Planar 3/RB 300 + DL103, Préamp Naka CA5E, Ditton 66 monitor rewired and Terminator 2 cable for loudspeakers.
Any advice ?
Best regards to all,
Laurent.
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